The package has a debian/watch file, but the last attempt
to use it for checking for newer upstream versions failed with
an error:
In watchfile debian/watch, reading webpage http://svn.codehaus.org/mojo/tags/ failed: 500 Can't connect to svn.codehaus.org:80 (Name or service not known)
Migration status for antlr-maven-plugin (2.2-4 to 2.2-5): Waiting for test results or another package, or too young (no action required now - check later)